. Electric railway journal . he use of turbo-generators. The accompanying boiler room changes il-lustrate also the development that has taken place in thelast ten years in boiler and stoker practice. Elaborating a little upon the last point it may bementioned that the original designers evidently plannedthat the station should be symmetrical about the trans-verse axis through the dry well and chimneys. Theyprobably did not intend to install more than two addi-tional engine units of about 2000-kw. capacity each,making the ultimate capacity about 8000 kw. Now byextending the engine room a single
. Electric railway journal . he use of turbo-generators. The accompanying boiler room changes il-lustrate also the development that has taken place in thelast ten years in boiler and stoker practice. Elaborating a little upon the last point it may bementioned that the original designers evidently plannedthat the station should be symmetrical about the trans-verse axis through the dry well and chimneys. Theyprobably did not intend to install more than two addi-tional engine units of about 2000-kw. capacity each,making the ultimate capacity about 8000 kw. Now byextending the engine room a single bay, ample space hasbeen provided for an ultimate development of 50,000kw., or about four times as much, based on overloadratings of the engine sets for peak loads. In the new work so far as practicable the rearrange-ment is being carried out on the unit plan, with respectto the apparatus serving each main turbine unit. Thusthe boilers, heaters, feed pumps, condensing apparatus, 1086 Electric Railway Journal Vol. 51, No. 23. June 8, 1918 Electric Railway Journal 1087 air washers, etc., will be installed in groups. This fea-ture is illustrated in the drawing of the main and auxil-iary steam piping, reproduced on page 1084. Inciden-tally this drawing shows how the engine room wasblocked out in a general way with possible future ex-tensions in mind, although as stated before specificplans for the future have not been made. A generalplan was. however, considered desirable in connectionwith the installation of the first turbine so that theprogressive steps should all form part of the final resultswith as little wastage as possible. A number of drawings have been reproduced here-with to show the general layout of the turbine room andparticularly of the auxiliaries. The turbine units areGeneral Electric-Curtis machines producing three-phase power at the transmission voltage of 13,200. Thusno step-up transformers are required in connection withthem. The water rate ofthe turbines at fu
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